phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '94979812e05b7e0023bce3798e5238f8' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('94979812e05b7e0023bce3798e5238f8', -1, 1416708904, 1416708904, 'adf5369f', 15, 0, 0)

Line : 245
File : sessions.php